US3574508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internally fired industrial gas burner
Assignee: Maxon Premix Burner Co Inc
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Filing: 1968-04-15
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Granted: 1971-04-13
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Expires: 1988-04-15
Abstract
Abstract A burner assembly includes a mixing and ignition chamber of a conical contour with the gaseous fuel being introduced through a series of nozzle discharge ports at the small end of the cone and directed generally parallel to the diverging cone surface. The combustion air is introduced into the cone through a plurality of cone apertures arranged in a series of axially spaced stages. Preferably, the cone apertures are canted to develop a swirling of the air about the cone center axis thereby enhancing fuel-air intermixture, ignition control and flame retention. A series of inwardly projecting circumferential bosses are preferably formed on the interior cone surface between respective aperture stages to divide the burner into a series of firing zones and also further enhance the aforesaid characteristics. Other features are disclosed.
Inventors
- 👤 Charles W Rothhaar
- 👤 Guy Richard Harter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:44
CPC Classifications
F; F23; F23D; F23D14/00; F23D14/34; F23D14/36; F23D99/00; F23D99/002; F23D99/004; F23D2206/00; F23D2206/0094
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
269 words
A burner assembly comprising: mixing and ignition cone means including an outwardly diverging substantially conical wall means defining a circumferentially enclosed air-gas mixing space, said wall means having a plurality of circumferentially spaced apertures in each of a series of axially spaced stages for admitting combustion air into said mixing space and said apertures being formed in said wall means for developing a rotational motion component of said combustion air relative to the central axis of said wall means to provide a layer of rotating combustion air about the interior surface of said conical wall means; air inlet means defining, in combination with the exterior surface of said wall means, a plenum chamber for accommodating coMbustion air that passes through said cone aperture into said mixing space; a gas discharge nozzle disposed at the smaller end of said wall means and including a plurality of gas discharge ports, the central axis of each of said ports being substantially parallel to the interior surface of said wall means for directing a gaseous fuel generally parallel to said interior surface of said wall means into interaction with said rotating combustion air to provide a predetermined gas-air intermixture and combustion characteristic within said mixing space at each of a progression of burner firing levels; and a plurality of circumferential bosses extending inwardly from the interior surface of said wall means and axially disposed intermediate respective stages of said cone apertures for defining a progression of firing zones within said mixing space to promote flame retention, fuel-air intermixture and combustion efficiency at each of a corresponding progression of firing levels of said burner.
Claim 2
Dependent Claim
269 words
A burner assembly comprising: mixing and ignition cone means including an outwardly diverging substantially conical wall means defining a circumferentially enclosed air-gas mixing space, said wall means having a plurality of circumferentially spaced apertures in each of a series of axially spaced stages for admitting combustion air into said mixing space and said apertures being formed in said wall means for developing a rotational motion component of said combustion air relative to the central axis of said wall means to provide a layer of rotating combustion air about the interior surface of said conical wall means; air inlet means defining, in combination with the exterior surface of said wall means, a plenum chamber for accommodating coMbustion air that passes through said cone aperture into said mixing space; a gas discharge nozzle disposed at the smaller end of said wall means and including a plurality of gas discharge ports, the central axis of each of said ports being substantially parallel to the interior surface of said wall means for directing a gaseous fuel generally parallel to said interior surface of said wall means into interaction with said rotating combustion air to provide a predetermined gas-air intermixture and combustion characteristic within said mixing space at each of a progression of burner firing levels; and a plurality of circumferential bosses extending inwardly from the interior surface of said wall means and axially disposed intermediate respective stages of said cone apertures for defining a progression of firing zones within said mixing space to promote flame retention, fuel-air intermixture and combustion efficiency at each of a corresponding progression of firing levels of said burner.
Claim 3
Dependent Claim
38 words
The burner of claim 1 in which each of said cone aperture stages from the narrowed inlet to the discharge end of said wall means is of a progressively greater total aperture area than a preceeding aperture stage.
Claim 4
Dependent Claim
27 words
The burner of claim 2 and further including impeller means coupled to said air inlet means for providing the total combustion air inlet to said mixing space.
Claim 5
Dependent Claim
66 words
The burner of claim 3 and further including gas inlet means coupled to said gas discharge nozzle and additionally comprising interconnected flow control valve means in respectively said gas inlet and said air inlet means for maintaining a predetermined interrelation of the quantity of said gas and said combustion air introduced into the enclosed region of said cone throughout the full firing range of said burner.
Claim 6
Dependent Claim
36 words
The burner of claim 4 in which the central axis of each of said cone apertures forms a predetermined acute angle with a radial of said cone means drawn through the center of said respective apertures.
Claim 7
Dependent Claim
41 words
The burner of claim 5 in which the angle between said center axis of said cone means and the interior surface thereof is within a predetermined range for providing a preselected combustion characteristic between the minimum and maximum burner firing levels.
Claim 8
Dependent Claim
52 words
The burner of claim 6 in which said cone means includes a series of four axially spaced aperture stages and in which the total cross-sectional area of the first through fourth stages progressively increases in a proportion to provide sufficient combustion air volume for complete stoichiometric combustion at each burner firing level.
Claim 9
Dependent Claim
62 words
The burner of claim 7 in which said burner assembly is adapted for operation with an air inlet pressure differential between said plenum chamber and said mixing space in the range of 0 to 5 inches water column and a gas inlet pressure differential between said gas inlet and said mixing space within the range of 0 to 4 inches water column.
Claim 10
Dependent Claim
54 words
The burner of claim 8 in which each of said aperture stages includes within the range of 6 to 12 apertures disposed in approximately equally spaced intervals about the circumference of said wall means and further in which the apertures of each stage are angularly offset relative to the apertures of an adjacent stage.
Claim 11
Dependent Claim
37 words
The burner of claim 9 in which the central axes said apertures are perpendicular to the surface of said wall means as viewed in respective longitudinal sections of said cone means taken through each of said apertures.
Claim 12
Dependent Claim
186 words
In a burner, the combination comprising: ignition and combustion cone means having an inlet end diverging outwardly toward a discharge end and defining an enclosed air-gas mixing space, said cone means having a plurality of circumferentially spaced apertures in each of a series of axially spaced stages for admitting combustion air into said mixing space and having a plurality of circumferential bosses extending inwardly from the interior surface of said cone for defining, in conjunction with said axially spaced aperture stages, a progression of burner firing levels; gas air inlet means for introducing combustion air through said apertures into said mixing space; gas inlet means including a discharge nozzle having an exterior dimension approximately equal to the interior of said cone inlet and positioned within said inlet of said cone means for introducing a gaseous fuel into said mixing space to effect a predetermined interaction with said combustion air; and flow control means coupled to both said air and said gas inlet means for proportionately regulating the quantities of air and gas introduced into said air-gas mixing space over the full firing range of said burner.
Claim 13
Dependent Claim
186 words
In a burner, the combination comprising: ignition and combustion cone means having an inlet end diverging outwardly toward a discharge end and defining an enclosed air-gas mixing space, said cone means having a plurality of circumferentially spaced apertures in each of a series of axially spaced stages for admitting combustion air into said mixing space and having a plurality of circumferential bosses extending inwardly from the interior surface of said cone for defining, in conjunction with said axially spaced aperture stages, a progression of burner firing levels; gas air inlet means for introducing combustion air through said apertures into said mixing space; gas inlet means including a discharge nozzle having an exterior dimension approximately equal to the interior of said cone inlet and positioned within said inlet of said cone means for introducing a gaseous fuel into said mixing space to effect a predetermined interaction with said combustion air; and flow control means coupled to both said air and said gas inlet means for proportionately regulating the quantities of air and gas introduced into said air-gas mixing space over the full firing range of said burner.
Claim 14
Dependent Claim
25 words
The burner according to claim 11 in which the central axes of said cone apertures are angulated toward the narrowed inlet of said cone means.
Claim 15
Dependent Claim
25 words
The burner according to claim 11 in which the central axes of said cone apertures are perpendicular to the central axis of said cone means.
Claim 16
Dependent Claim
19 words
The burner of claim 11 in which said cone apertures are in the form of circumferentially elongated rectangular slots.
Claim 17
Dependent Claim
41 words
The combination of claim 11 in which said gas discharge nozzle comprises a series of circumferentially spaced gas inlet ports, said ports being formed to develop a rotational motion component of said gas about the central axis of said cone means.
Claim 18
Dependent Claim
32 words
The combination of claim 11 in which said cone apertures are formed so as to develop a rotational motion component of said combustion air about the central axis of said cone means.
Claim 19
Dependent Claim
31 words
The combination of claim 15 in which said cone aperture stages are of progressively greater total aperture area in the order of their sequence from said inlet to said discharge end.
Claim 20
Dependent Claim
41 words
The combination of claim 17 in which said plurality of annular bosses extend progressively further inwardly toward said center axis of said cone means in the order of their sequence from said inlet to said discharge end of said cone means.
Claim 21
Dependent Claim
59 words
The combination of claim 18 in which said gas discharge nozzle includes a plurality of circumferentially spaced gas discharge ports having respective central axes defining respective angles with the central axis of said cone means which respective angles are at least as great as the angle formed between said central axis and the interior surface of said cone means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |